Fifteen wickets fell on a captivating first day of County Championship action at Hove as Leicestershire stumbled to 131-5 to trail Sussex by 42 runs.
Tom Taylor (6-47) starred as Sussex slumped to 36-5, but David Wiese (51) took advantage of some wayward change bowling to halt the away side's charge.
Valuable lower-order contributions from Ollie Robinson (23) and Danny Briggs (20) helped the hosts post 173.
Leicestershire collapsed to 59-5 but Lewis Hill (40 not out) led a recovery.
Hill hit four fours and a six as he shared an unbroken stand of 72 with Harry Dearden (26 not out) before play finished early because of bad light.